Method and apparatus for configuring physical random access channel

Abstract

A method and an apparatus for configuring a physical random access channel are provided. The method includes: receiving a pattern identifier configured by an access network device, where the pattern identifier configures a first physical resource configuration pattern of the physical random access channel corresponding to a first subcarrier spacing in a frequency domain; determining a second subcarrier spacing of a target cell; and determining a second physical resource configuration pattern of the physical random access channel corresponding to the second subcarrier spacing in the frequency domain according to the pattern identifier and the second subcarrier spacing.

What is claimed is: 
     
       1. A method for configuring a physical random access channel, comprising:
 receiving a pattern identifier configured by an access network device, wherein the pattern identifier configures a first physical resource configuration pattern of the physical random access channel corresponding to a first subcarrier spacing in a frequency domain; 
 determining a second subcarrier spacing of a target cell; and 
 determining a second physical resource configuration pattern of the physical random access channel corresponding to the second subcarrier spacing in the frequency domain according to the pattern identifier and the second subcarrier spacing; 
 wherein determining the second physical resource configuration pattern of the physical random access channel corresponding to the second subcarrier spacing in the frequency domain according to the pattern identifier and the second subcarrier spacing comprises: 
 determining a first frequency domain parameter corresponding to the first physical resource configuration pattern and the first subcarrier spacing according to the pattern identifier; and 
 obtaining a second frequency domain parameter corresponding to the second physical resource configuration pattern by converting the first frequency domain parameter corresponding to the first physical resource configuration pattern according to a relationship between the first subcarrier spacing and the second subcarrier spacing; wherein the first frequency domain parameter comprises a number of repetitions of a physical random access channel sequence sent in the first physical resource configuration pattern; the second frequency domain parameter comprises a number of repetitions of a physical random access channel sequence sent in the second physical resource configuration pattern. 
 
     
     
       2. The method of  claim 1 , wherein
 a frequency domain bandwidth occupied by the first physical resource configuration pattern is the same as a frequency domain bandwidth occupied by the second physical resource configuration pattern; 
 and, 
 a relative position occupied by the first physical resource configuration pattern in the frequency domain bandwidth is the same as a relative position occupied by the second physical resource configuration pattern in the frequency domain bandwidth. 
 
     
     
       3. The method of  claim 1 , wherein the first subcarrier spacing is equal to 2 n  times the second subcarrier spacing, wherein n is a positive or negative integer; the pattern identifier indicates the first physical resource configuration pattern configured for the first subcarrier spacing;
 the number of PRBs occupied by the first physical resource configuration pattern is ½ n  times the number of PRBs occupied by the second physical resource configuration pattern; 
 a first number of physical random access channel sequences sent in the first physical resource configuration pattern is ½ n  times a second number of physical random access channel sequences sent in the second physical resource configuration pattern. 
 
     
     
       4. The method of  claim 1 , wherein the first position occupied by the physical random access channel sequences sent in the first physical resource configuration pattern in the frequency domain bandwidth comprises:
 at least two frequency domain units, wherein the at least two frequency domain units are in a one-to-one correspondence with the physical random access channel sequences, and the physical random access channel sequence sent in each frequency domain unit is repeated; 
 wherein the at least two frequency domain units are in an axisymmetric pattern according to a symmetry axis, and transmission positions of the physical random access channel sequences in the at least two frequency domain units are aligned on both sides, in the center or on one side according to the symmetry axis. 
 
     
     
       5. The method of  claim 4 , wherein
 the at least two frequency domain units comprises four frequency domain units at the same time domain position, and the four frequency domain units are uniformly distributed in the frequency domain bandwidth and occupy at least a preset proportion of the frequency domain bandwidth; 
 or, 
 the at least two frequency domain units comprise two frequency domain units at the same time domain position, and the two frequency domain units are distributed at both ends according to the symmetry axis within the frequency domain bandwidth and occupy at least a preset proportion of the frequency domain bandwidth. 
 
     
     
       6. The method of  claim 1 , wherein
 the first subcarrier spacing is one of 15 kHz, 30 kHz, and 60 kHz, and the second subcarrier spacing is another one of 15 kHz, 30 kHz, and 60 kHz. 
 
     
     
       7. The method of  claim 1 , wherein determining the second subcarrier spacing of the target cell comprises:
 receiving a subcarrier space (SCS) identifier configured by the access network device for the target cell, wherein the SCS identifier is configured to indicate the second subcarrier spacing; 
 or, 
 determining the second subcarrier spacing predefined by the target cell. 
 
     
     
       8. A terminal, comprising:
 a processor; 
 a transceiver connected to the processor; and 
 a memory configured to store instructions executable by the processor; 
 wherein, the processor is configured to: 
 receive a pattern identifier configured by an access network device, wherein the pattern identifier configures a first physical resource configuration pattern of the physical random access channel corresponding to a first subcarrier spacing in a frequency domain; 
 determine a second subcarrier spacing of a target cell; and 
 determine a second physical resource configuration pattern of the physical random access channel corresponding to the second subcarrier spacing in the frequency domain according to the pattern identifier and the second subcarrier spacing; 
 wherein the processor is further configured to: 
 determine a first frequency domain parameter corresponding to the first physical resource configuration pattern and the first subcarrier spacing according to the pattern identifier; and 
 obtain a second frequency domain parameter corresponding to the second physical resource configuration pattern by converting the first frequency domain parameter corresponding to the first physical resource configuration pattern according to a relationship between the first subcarrier spacing and the second subcarrier spacing; wherein the first frequency domain parameter comprises a number of repetitions of a physical random access channel sequence sent in the first physical resource configuration pattern; the second frequency domain parameter comprises a number of repetitions of a physical random access channel sequence sent in the second physical resource configuration pattern. 
 
     
     
       9. A non-transitory computer-readable storage medium, stored thereon with executable instructions, wherein the executable instructions are configured to be loaded and executed by a processor to implement acts comprising:
 receiving a pattern identifier configured by an access network device, wherein the pattern identifier configures a first physical resource configuration pattern of a physical random access channel corresponding to a first subcarrier spacing in a frequency domain; 
 determining a second subcarrier spacing of a target cell; and 
 determining a second physical resource configuration pattern of the physical random access channel corresponding to the second subcarrier spacing in the frequency domain according to the pattern identifier and the second subcarrier spacing; 
 wherein determining the second physical resource configuration pattern of the physical random access channel corresponding to the second subcarrier spacing in the frequency domain according to the pattern identifier and the second subcarrier spacing comprises: 
 determining a first frequency domain parameter corresponding to the first physical resource configuration pattern and the first subcarrier spacing according to the pattern identifier; and 
 obtaining a second frequency domain parameter corresponding to the second physical resource configuration pattern by converting the first frequency domain parameter corresponding to the first physical resource configuration pattern according to a relationship between the first subcarrier spacing and the second subcarrier spacing; wherein the first frequency domain parameter comprises a number of repetitions of a physical random access channel sequence sent in the first physical resource configuration pattern; the second frequency domain parameter comprises a number of repetitions of a physical random access channel sequence sent in the second physical resource configuration pattern. 
 
     
     
       10. The terminal of  claim 8 , wherein
 a frequency domain bandwidth occupied by the first physical resource configuration pattern is the same as a frequency domain bandwidth occupied by the second physical resource configuration pattern; 
 and, 
 a relative position occupied by the first physical resource configuration pattern in the frequency domain bandwidth is the same as a relative position occupied by the second physical resource configuration pattern in the frequency domain bandwidth. 
 
     
     
       11. The terminal of  claim 8 , wherein the first subcarrier spacing is equal to 2 n  times the second subcarrier spacing, wherein n is a positive or negative integer; the pattern identifier indicates the first physical resource configuration pattern configured for the first subcarrier spacing;
 the number of PRBs occupied by the first physical resource configuration pattern is ½ n  times the number of PRBs occupied by the second physical resource configuration pattern; 
 a first number of physical random access channel sequences sent in the first physical resource configuration pattern is ½ n  times a second number of physical random access channel sequences sent in the second physical resource configuration pattern. 
 
     
     
       12. The terminal of  claim 8 , wherein the first position occupied by the physical random access channel sequences sent in the first physical resource configuration pattern in the frequency domain bandwidth comprises:
 at least two frequency domain units, wherein the at least two frequency domain units are in a one-to-one correspondence with the physical random access channel sequences, and the physical random access channel sequence sent in each frequency domain unit is repeated; 
 wherein the at least two frequency domain units are in an axisymmetric pattern according to a symmetry axis, and transmission positions of the physical random access channel sequences in the at least two frequency domain units are aligned on both sides, in the center or on one side according to the symmetry axis. 
 
     
     
       13. The terminal of  claim 12 , wherein
 the at least two frequency domain units comprises four frequency domain units at the same time domain position, and the four frequency domain units are uniformly distributed in the frequency domain bandwidth and occupy at least a preset proportion of the frequency domain bandwidth; 
 or, 
 the at least two frequency domain units comprise two frequency domain units at the same time domain position, and the two frequency domain units are distributed at both ends according to the symmetry axis within the frequency domain bandwidth and occupy at least a preset proportion of the frequency domain bandwidth. 
 
     
     
       14. The terminal of  claim 8 , wherein
 the first subcarrier spacing is one of 15 kHz, 30 kHz, and 60 kHz, and the second subcarrier spacing is another one of 15 kHz, 30 kHz, and 60 kHz. 
 
     
     
       15. The terminal of  claim 8 , wherein the processor is configured to:
 receive a subcarrier spacing (SCS) identifier configured by the access network device for the target cell, wherein the SCS identifier is configured to indicate the second subcarrier spacing; 
 or, 
 determine the second subcarrier spacing predefined by the target cell.